I'm not sure which is more limiting, the CPU of the Mac or the drive interface, USB 2 or 3, or FireWire.

I don't know any app that can do two drives at once, but maybe that limitation was bc the old current state of tech.

With a core2duo CPU and USB 2, one drive at once made sense, but nowadays, 2-12 cores and hyper threading, along with USB 3 and Thunderbolt, I see the potential. Will the app devs have to rewrite their apps?

Thanks for briningg this up, I don't think the option is available now but probably in the future.

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